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sub: add SDH subtitle filter

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Add subtitle filter to remove additions for deaf or hard-of-hearing
(SDH). This is for English, but may in part work for others too.
This is an ASS filter and the intention is that it can always be
enabled as it by default do not remove parts that may be normal text.
Harder filtering can be enabled with an additional option.

Signed-off-by: wm4 <wm4@nowhere>
This commit is contained in:
Dan Oscarsson
2017-02-02 10:53:19 +01:00
committed by wm4
parent 3e93c09cff
commit 5b75142a1d
8 changed files with 506 additions and 5 deletions
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26
sub/sd_ass.c
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@@ -259,8 +259,15 @@ static void decode(struct sd *sd, struct demux_packet *packet)
packet->duration = UNKNOWN_DURATION;
}
char **r = lavc_conv_decode(ctx->converter, packet);
for (int n = 0; r && r[n]; n++)
ass_process_data(track, r[n], strlen(r[n]));
for (int n = 0; r && r[n]; n++) {
char *ass_line = r[n];
if (sd->opts->sub_filter_SDH)
ass_line = filter_SDH(sd, track->event_format, 0, ass_line, 0);
if (ass_line)
ass_process_data(track, ass_line, strlen(ass_line));
if (sd->opts->sub_filter_SDH)
talloc_free(ass_line);
}
if (ctx->duration_unknown) {
for (int n = 0; n < track->n_events - 1; n++) {
if (track->events[n].Duration == UNKNOWN_DURATION * 1000) {
@@ -272,9 +279,18 @@ static void decode(struct sd *sd, struct demux_packet *packet)
} else {
// Note that for this packet format, libass has an internal mechanism
// for discarding duplicate (already seen) packets.
ass_process_chunk(track, packet->buffer, packet->len,
llrint(packet->pts * 1000),
llrint(packet->duration * 1000));
char *ass_line = packet->buffer;
int ass_len = packet->len;
if (sd->opts->sub_filter_SDH) {
ass_line = filter_SDH(sd, track->event_format, 1, ass_line, ass_len);
ass_len = strlen(ass_line);
}
if (ass_line)
ass_process_chunk(track, ass_line, ass_len,
llrint(packet->pts * 1000),
llrint(packet->duration * 1000));
if (sd->opts->sub_filter_SDH)
talloc_free(ass_line);
}
}